Plural form of candidness; multiple instances or types of the quality of being honest and frank.
Regular English pluralization of candidness (candid + -ness + -es). The double plural is rare and typically appears in academic or theoretical discussions about different manifestations of honesty.
Most nouns don't get pluralized this way—you rarely say 'honesties' or 'sincerites'—so 'candidnesses' is technically correct but almost never used because we don't think of honesty as something you can have multiple types of!
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